Extension bolt



Patented Sept. 2, 1924.

UNITED STATES g r 1,507,488 PATENT. 'o r1.c'E.

nMIL EDWARD KRAEMER, or HIGKSVTLLE, new YonK'.

' EXTENSION BOLT.

, Application filed May 9,

To all whom it may concern: v

Be it known that I, EMIL E. KRAEM R, a citizen of the United States, and a resident of Hicksville, in the county of Nassau and State of New i'ork, have invented new and useful Improvements in Extension Bolts, of which the i'ollowingis a full, clear, and, exact description. I I

This invention relates to; extension bolts primarily designed for use in conjunction with the slotted table of a shaper or any other machin having a slotted table.

in machine work when ordinary bolts with; square heads shaped to fit the slots of a machine table are used there is always a lot of work required in changing the bolts in order to provide a bolt suited to the article that is being clamped on the table. Often the machinist neglects to change the bolts and endeavors to make use of the bolts in position in the machine table. When these bolts are too short for the work the nuts used for clamping the work in position do not get suflicient grip and the threads on the ends of the bolts are usually strained or stripped from the bolts.

The general object of this invention is the provision of a simple and durable extension bolt, for use in conjunction with the slotted tables of machines, that may be adjusted in length so as to be adapted for the clamping or articles of difierent sizes in position on the machine table.

A further object of the invention is the provision of .an extension bolt provided with a removable shank for facilitating the changing of the shank when necessary in order to accommodate certain types of articles that it is desired to machine.

This object is accomplished by providing a sleeve with a T -shaped head formed on its lower end and having an internal thread with which a stud bolt engages so that the latter may be adjusted in the sleeve so as to give different lengths above the same, and providing means for locking the stud bolt in different positions in the sleeve.

These and other objects of the invention will be more clearly understood from the following detailed description and accompanying drawings.

Figure 1 is a side elevation of the extension bolt showing it in position in the slotted table; 1

Figure 2 is a side elevation of the extension bolt, similar to Figure l, with a portion 1922. Serial No. 559,564.].

oi the sleeve cut away to show the. construc l; i t Figure 3 is asection along theline l igurel; Y v

l iguree is a side elevation ofthe exten; sion bolt with av short the sleeve. r

shown with a T-slot 11 provided therein.

A sleeve 12 provided withv an enlarged end po w .v a .T-s p d head is formed, is mounted in the slot 11 in the;

table 10. An internal thread l3 is provided in the upper end; of the sleeve 12 while the lower end, as shown at 22, is unthreaded.

shan i p s i n Mounted in theg sleeve .12 and engaging. with the internal thread 13 of the sleeve opening 17 so that the operator can observe when the stud bolt has a proper connection with the sleeve.

The length of the threaded portion of v the lower end of the stud bolt 16 is greater than the threaded portion of the upper end. This allows the stud bolt to be adj usted in the sleeve 12 so as to give different lengths above the sleeve. A look nut 18 is mounted on the lower threaded end of the stud bolt for locking the studvbolt in any desired position in the sleeve. Mounted on the upper end of the stud bolt is a nut 19, i a washer 20 and a plate 21 used for clamping any article on the table 10.

Figure 4; shows the extension bolt with a very short stud bolt 16. In certain cases when the stud bolt 16is too long and cannot be adjusted in the sleeve 12 so as to accommodate the work it may. be. removed from the sleeve and a stud bolt of the de sired length substituted.

When using this extension. bolt the head is first positioned, in the slot and the stud bolt then screwed into position. The stud bolt 16 is then adjusted in the sleeve to suit the article to be clamped on the table and the lock nut 18 is tightened, locking the stud bolt in the desiredposition. Then by the 'meviiig the T-shap'ed head 15 along the "slot 11 the sleeve 12 may be positioned at diffren't points Ont-lie table 10 so that the article to be Worked upon may be clamped on-tlietable in any desired position.

--I 'Woul'd state *ineono'lu'sion that While the illustrated example constitutes a practical e iibotlini'eiit tif "my invention I do not "liihit I'iiyselffstrictl'y to the exact details herein illustratedslineeinanifstly the saiue can be considerably varied Without departing from the "s'pirit ofitlieinvention as defined in the appended claims.

(llainfs': a

V "1, in Loihbination tVit-h a tableyprovided with T sl'ots, *a device of theclass described, etmprisin "a sleeve having an internal optnni eiitendiii'g longitudinally there through, a head formed on the lower end of said, sleeve, and shaped to fit into the 2. An men-swatch ofthe classdeseribea for use with tables-havingTslots for-riled therein, comprising a sleeve having an opening extending longitudinally through the sleeve, provided above the efila-q'g'ed lower end thereof with an opening for observation purposega T-shaped head formed -'on the lower end shaped-to fit into the, T slot s,

a stud bolt for engagingin the sleeve, -a lock nut mounted-on the stud bolt for lockmg it in position in thesleeve, and means mounted on the upper endof the stud bolt ,for clamping an article in positionbn EMILnnWAe-n imitEM-ER 

